Sieve.



Patented lan. I, |90I. I H. S. VROUMAN.

SIEVE.

tion med .ruhe s, 1900.

( Applica f IN1/Emme.

Y TOR/v5? STATES UN ITE HARRY S. VROOMAN, 0F CHICAGO, ILLINOIS.

SIEVE.

SPECIFICATION forming part of Letters Patent No. 665,149, dated January 1, 1901.

Application iled June 6, 1900. Serial No. 19.300. (No model.)

To all when@ it may concern.'

Be it known that I, HARRY S. VRooMAN, a citizen of the United States, 'residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sieves; and I do hereby declare the following to be af ull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates particularly to that class of sieves used by melders in sifting sand, though its construction adapts it for use in sifting any material by a hand-sieve. Molders sand, by reason of being damp as Well as heavy, is more or less diflicult to sift, because of its tendency to pack in the sieve, thus requiring greater strength and more agitation than most materials in orde'r to ac- 'complish desired results.

The objects of my invention are to provide a maximu m sifting area in a hand-sieve of the class described, to prevent the packing of the sand, and to strengthen the sieve-bottom.

Figure l is a perspective view of my improved sieve. Fig. 2 is a cross-section view of the same.

Referring to the drawings, A represents the wood rim of a circular sieve, to which by means of a hoop B is secured in the usual .manner the bottom C.

The sievebottom C consists of a disk of wire gauze or cloth, the mesh being of any desired size. Formed in the bottom C, by stamping with a suitable press, are a plurality of grooves or corrugations D D, arranged alternately in concentric circles and extending from near the center (which is elevated) to the rim A. The walls of the corrugations are preferably given a long and gradual pitch and merge on the lines of compound curves, thus facilitating the effective distribution of the sand or material to be sifted over the bottom of the sieve as it is agitated in the usual manner. The pitch or angularity of the walls of the grooves and ridges is sucient, however, to afford some resistance to the particles of sand or material as they are shaken back and forth, and thus thoroughly agitated.l It should be understood that the gradual curvature of the walls of the grooves and ridges is important, as if the walls were abrupt the damp sand would settle in the grooves and I am aware, to provide a sieve with a bottom Yformed of wire gauze or cloth in which corrugations have been pressed in concentric circles. By this construction I not only stien the sieve-bottom and increase the sifting area to a maximum degree, but I provide for a more effective sifting of the material by causing it to strike against the ridges, no matter in what direction the sieve is agitated or in what direction the grain or particles fall. A workman handling a sieve in actual practice will seldom grasp it in picking it up at the same points twice in succession, and he does not want an article that must be turned around to certain position before it can be used. Furthermore, in agitating the sieve back and forth he will gradually rotate it in order to present the material most effectively` to the sifting-surface. If the ridges or corrugations extend longitudinally-or in a single direction, the sieve could be effectively agitated or reciprocated in but one plane, and that at an angle to the lines of corrugations. In my sieve the corrugations are at an angle to the lplane of reciprocation, no Vmatter in what directiony it may be moved; hence the principal utility of this invention.

Having thus described my invention, what I claim as new, and desire to obtain by Letters Patent, is-

A sieve having a bottomcomposed of wire gauze or cloth formed with a plurality of corrugations arranged in concentric circles, as described.

In testimony whereof I affix my signature Ioo in presence of two witnesses.

HARRY S. VROOMAN.

Witnesses F. BENJAMIN, LOUIS CHASE. 

